JPH0217280A - Flow regulating valve - Google Patents

Abstract

PURPOSE:To get rid of a moment caused by the negative pressure of water which flows out of the flow passage of a valve seat by forming the valve seat into an ark shape which is coaxial with a shaft while forming a valve piece which is revolved around the shaft also into an ark shape coaxial with the shaft. CONSTITUTION:A float 24 which is revolved around a shaft 20 is placed in a cistern 12 having the inlet 24, outlet 26, and overflow port 30 of water. A valve seat 31 is formed into an ark shape which is coaxial with the shaft 20 while forming a valve piece 32 which is linked to the float 24 also into an ark shape coaxial with the shaft 20. The float 24 is lifted up/down in accordance with the water level 23 in the cistern 12 and the valve piece 32 is revolved around the shaft 20, to regulate a flow rate flowing out of the flow passage 31a of the valve seat 31. Since the whole force which acts on the valve piece 32 because of the negative pressure of water flowing out at that time acts in the direction of the shaft 20, no moment is generated and the float 24 is operated only under the effect of water level 32 to accurately control the water level.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a flow rate regulating valve provided in a cistern of a water heater with a bath kettle, etc., which supplies hot water heated by a heater to a bathtub via the cistern.

Conventional technology Generally, a cistern is installed in the waterway that fills the bathtub with hot water to prevent water from flowing backwards from the bathtub side to the water supply side. A flow 1 regulating valve is provided.

Conventionally, a flow rate regulating valve installed in a cistern of a water heater with a bathtub is connected to a shaft 20, a valve seat 21, a valve piece 22 that rotates around the shaft 20, and a valve piece 22, as shown in FIG. It is equipped with a float 24 that moves according to the water level 23 of °
there was. Hot water heated by a heater (heat exchanger) is supplied to the cistern 12 from the inlet 25 and is conveyed to the bathtub through the valve seat 21 and the outlet 26. When the amount of hot water flowing in from the inlet 25 is greater than the amount of hot water being discharged to the outlet 26, the water level 23 rises and pushes up the float 24. When the float 24 rises, the valve piece 22 also rotates around the shaft 20 and the gap 27 between it and the valve seat 21 increases.
expands. As a result, the flow path 21 provided in the valve seat 21
Since the fluid resistance of the hot water flowing through m decreases, the amount of hot water discharged to the outlet 26 increases and the water level 23 stops rising. On the other hand, the fourth
In the figure, when the amount of hot water flowing in from the port 25 is less than the amount of hot water being discharged to the outlet 26, the water level 23 falls and pushes down the float 24. When the flow) 24 descends, the valve piece 22 also moves toward the shaft 20.
As a result, the fluid resistance of the hot water flowing through the flow path 21 of the valve seat 21 increases, so the amount of discharge to the outlet 26 decreases, and the water level 23 decreases.
stops descending. Due to the above action, even if the inflow amount of hot water from the inlet 25 fluctuates, the movement of the float 24 will cause the gap 2 to
7 to control the discharge amount to the outlet 26, it is possible to prevent air from flowing in from the valve seat 21 and hot water from flowing out from the overflow 02.

Problems to be Solved by the Invention However, in the above-mentioned flow rate regulating valve, the third
If the water level in cistern 12 is high as shown in the figure,
Most of the mechanical action that adjusts the fluid resistance in the flow path 211 depends on the moment due to the buoyancy of the float 24, so the flow rate through the flow path 21 is almost accurately controlled by changes in the water level within the cistern 12, so there are almost no problems. However, a problem arises when the water level in the cistern 12 is low, as shown in FIG. In other words, as the water level in the cistern 12 decreases, the gap 27 becomes smaller and the outlet 26
The hot water flowing therein acts as a negative pressure on the flow path closing part 22m of the valve piece 22, and when the water level becomes even lower, the moment due to the negative pressure becomes larger than the moment due to the buoyancy of the float 24. is pulled down and the valve piece 22
Flow that adheres to the valve seat 21 and follows the water level in the cistern 12) Is the flow accurate in 24? control becomes impossible.

One way to solve the above problem is to increase the size of the float 24, but this increases the size of the cistern 12, making it impossible to create a compact product if it is built into, for example, a water heater with a bath kettle.

The present invention solves the above problems and uses a small float to
To provide a flow rate regulating valve that can accurately control hot water flowing therein.

Means for Solving the Problems In order to solve the above problems, the flow rate regulating valve of the present invention includes an arc-shaped valve seat concentric with an axis within a cistern having an inlet and an outlet for water and an overflow port communicating with the atmosphere; A valve piece that rotates around a shaft and has an arc concentric with the shaft, and that is provided on a valve seat and that adjusts the resistance of the flow path by adjusting the opening area of the flow path that communicates with the water outlet; It is equipped with a float that is connected to the cistern and moves according to the water level in the cistern.

Effect With the above configuration, when the amount of water supplied to the cistern from the water inlet increases, the water level in the cistern rises. When the water level rises, the float rotates upward around its axis, and as a result, the valve piece connected to the float rotates upward, expanding the opening area of the flow path provided in the valve seat, and water flows out from the cistern's outlet. The amount of water increases and balances with the amount of water flowing into the cistern from the water inlet. Conversely, when the amount of water supplied from the water inlet to the cistern decreases, the water level within the cistern decreases. When the water level drops, the float rotates downward around its axis, and as a result, the valve piece connected to the float rotates downward, reducing the opening area of the flow path provided in the valve seat, and water flows out from the cistern's outlet. The amount of water decreases and balances with the amount of water flowing into the cistern from the water inlet.

In the above action, the negative pressure of the water flowing out from the flow path of the valve seat acts on the valve piece and tries to attract the valve piece to the valve seat. However, in general, pressure acts perpendicularly to a surface, so the valve piece in the present invention rotates around an axis and has an arc concentric with this axis, so negative pressure applied to any part of the arc of the valve piece can be avoided. It is perpendicular to the circular arc and acts concentratedly in the axial direction, and no matter what state the opening area of the flow path changes depending on the position of the valve seat and valve leaf, no moment about the axis will act on the valve leaf. . Therefore, the negative pressure of water flowing out from the water outlet does not interfere with the float connected to the valve piece, and the float moves only under the influence of the water level in the cistern.

EXAMPLE A flow rate regulating valve showing an example of the present invention will be described below with reference to FIG. In FIG. 1, the same components as in the conventional example are denoted by the same reference numerals, and detailed explanation thereof will be omitted. That is, when the amount of water flowing in from the inlet 25 is greater than the amount of water being discharged to the outlet 26, the water level 23 rises and pushes up the float 24. A valve piece 32 that rotates around the shaft 20 and has a concentric circular arc is connected to the float 24 and rotates together with the float 24. Inside the valve piece 32, there is an arc-shaped valve seat 31 that is concentric with the shaft 20, and when the valve piece 32 rotates upward, the gap 33 expands and the flow path 31m provided in the valve seat 31 expands.
The flow rate of water flowing through the outlet 26 increases. As a result, the rise in water level 23 stopped and stabilized, and overflow level 3
It never overflows from 0. On the other hand, in Figure 2, the population is 2.
When the inflow of water from 5 is smaller than the amount of water discharged to the outlet 26, the water level 23 falls and pushes down the casing C1-) 24.

When the foot 24 is pushed down, the gap 33 with the valve seat 31 is reduced, and the flow rate of water flowing through the outlet 26 via the flow path 31a is reduced. As a result, the water level 23 stops falling and no air is sucked in through the gap 33.

In the above action, the negative pressure of the hot water flowing through the outlet 26 acts on the valve piece 32 and attempts to attract the valve piece 32 to the valve seat 31, but the valve piece 32 receives negative pressure in the circular arc 34 that is concentric with the shaft 20. Therefore, any negative pressure applied to any part of the arc 34 acts concentratedly in the direction of the shaft 20, and no matter what condition the gap 33, which changes depending on the position of the valve seat 33 and the valve piece 32, is, there is no negative pressure on the valve piece 32. No moment is generated due to pressure.

Therefore, the float 24 operates under the influence of only the water level 23, so even if the float 24 is made small, the amount of water flowing out from the outlet of the cistern 12 can be accurately controlled by changing the water level inside the cistern 12.

Effects of the Invention As is clear from the description of the embodiments above, the flow rate regulating valve of the present invention has an arc-shaped valve seat that rotates around an axis and is concentric with the axis, and an arc-shaped valve seat that rotates around the axis. a valve piece having;
Since it consists of a float connected to it, even if the negative pressure of the water flowing out from the flow path of the valve seat acts on the valve piece and draws the valve piece to the valve seat, the valve piece rotates around the axis, and it rotates in a circle concentric with this axis. Since the valve has a circular arc, any negative pressure applied to any part of the circular arc is applied in a direction perpendicular to the circular arc, and all acts concentratedly in the axial direction, so that no force (moment) is generated to rotate the valve piece.

As a result, the float connected to the valve piece is not affected by negative pressure. Therefore, the float operates in response only to changes in the water level, so accurate flow rate adjustment is possible even if the float is small.

[Brief explanation of the drawing]

FIGS. 1 and 2 are block diagrams of a flow rate regulating valve showing one embodiment of the present invention, and FIGS. 3 and 4 are block diagrams of a conventional flow rate regulating valve. 12...Sistern, 20...! L2
3...Water level, 24...Float, 25
...Entrance, 26...Exit, 30...
...Overflow, 31...Valve seat, 31m
...Flow path, 32...Valve piece, 34...
···arc. Name of agent: Patent attorney Shigetaka Awano and 1 other person12
- Cistern m-Experiment n-・-Ice Level Ki...-70-To 6~・-Slot Sword-O 31・-Intermediate 31a-1 Ryu 32-・Valve 34-・-Yen

Claims (1)

[Claims] The valve has an arc-shaped valve seat that is concentric with a shaft in a cistern having an inlet and an outlet of water and an overflow port that communicates with the atmosphere, and a circular arc that rotates about the shaft and is concentric with the shaft; A valve piece that is provided on the seat and adjusts the resistance of the flow path by adjusting the opening area of the flow path communicating with the water outlet, and a float that is connected to the valve piece and moves to follow the water level in the cistern. flow control valve.